OEM 7000 Wireless Fuel Level Monitor The Beckett Rocket is a wireless ultrasonic fuel level monitor complete kit which includes Receiver, Transmitter, 2inch NPT adapter, 2 mounting screws, and instructions. Provides visual and audible warning when oil is low Multiple receivers can be set up to receive from one transmitter The omni-directional transmitter allows the receiver(s) to be located anywhere within 150 ft of the transmitter.